US1067929A - Blowpipe. - Google Patents

Description

A. G. LE CHATELIER.

BLOWPIPB. APPLICATION FILED SEPT. l0, 1908.

Y JW fzfwzg@ Patented July 22, 1913.

ANDR GABRIEL LE CHATELIER, OF MARSEILLE, FRANCE.

BLOWPIPE.

Specification of Letters Patent.

Patented Jaiyee, isla,

Application led September 10, 1908. Serial No. 452,493.

To all whom may concern.'

Be it known that I, ANDR GABRIEL LE li-iii'rnriicn, a citizen of the French Republic, and resident of Marseille, France, have invented certain new and useful Improvements in Blowpipeae which the following is a specification.

-This invention has reference .to means for regulating the feed of gases in blow-pipes.

It has been observed that in apparatus such as oxyhydric, ox'y-acetylenic or other blow-pipes in which one of the gases under a low pressure is drawn along by means of an injector or some mixing device, owing to the pressure under which the other gas is used, the flame originally regulated to suit the work to be done deteriorates gradually as the blow-pipe becomes heated. If for example an oxy-ace-tylenic blow-pipe be employed in which the acetylene produced by a generator is drawn along by a'current oi oxygen under pressure, it Will be noticed that the flame which was properly regulated to commence with becomes gradually oxidizing. This might be very detrimental to the qualit-y of the Work to be done, particularly in the case of the autogenous soldering or iron and steel, the eect of the oxidization being to increase considerably the resistance of the metal to the soldering. The action .of this phenomenon may be readily observed by heating at one point a pipe in which a gaseous current circulates fed from a reservoir whence the as issues at a definite pressure; it Will e found that the volume or' gas discharged goes on diminishing as the creased. It lis as if the heating produced a resistance to the circulation of the gas, 'a resistance which may be compared to a counter-pressure which Would have the same retarding ei'i'ect upon the flowI of the gas. It follows that the heating or' the body of the blow-pipe Will have its greatest retarding effect on that gas which is admitted to it under the lowermost pressure, and consequently the relative proportion of the second gas in the mixture will increase. In the case of the Oxy-acetylenic blow-pipe for example the proportion of acetylene Will diminish more quickly than that of the oxygen and the flame Will become oxidizing, as already indicated above.

The object of the present invention is to remedy this defect, and this is readily aclocal heating of the pipe is in f complished by utilizing the phenomenon itself of the resistance produced by the heating or' the passage in which the gas circulates. For this purpose all that is necessary is to modify the course of the pipe which leads the high pressure gas to the mixing chaniber-the oxygen, in the case of the oxyacetylenic bloW-pipe-so that this pipe receives a supplementary heating upon a certain portion of itslength, for example by causing it to make one or more turns around the head of the blowpipe in proximity to the Haine.

v In the accompanying drawing: the ligure shows this arrangement in elevation.

In the figure, l is the feed tube of the gas under low pressure (combustible gas) and 2 is the high pressure gas tube (for the oxygen) arranged as explained above.

The correctness of the views which have led up to this method is demonstrated in another Way by the fact that if the length of pipe submitted to the action of the flame be increased unduly, the object in view rs overstepped, causing a derangement the reverse of that which it is desired to obviate. By suitably regulating for each blow-pipe the arrangement of the tube with a View to the heating of the high pressure gas, there will be no deterioration of the iame during the progress of thel Work, either in the one direction or in the other, a result Whichis so much the more important seeing that this deterioration, when it takes place, rcornes about gradually and escapes for some time the attention of the Workman. y

Having now fully described my' said invention,iWhat claim and desire to secure by Letters Patient, is

'1. In a blorfv pipe, the combination of a nozzle with pipes conveying gases of di'erent pressures into said nozzle, the pipe hav` ing the gas under hio'her ressure embodying a portion extending ongitudinally of the nozzle and a portion coiled around said nozzle back of the discharge port of said nozzle and a portion extending into the reai end of said nozzle in alinement With said discharge port, whereby the gas passinfr through the coil is heated and expanded, su stantially as specified.

nozzle with pipes conveying gases under different pressure into said nozzle,one of said pipes having a looped portion lying 2. In a blow pipe, the combination of a nozzle in the zone of the heat fom the ame along the sds and paralel to the length I In tesbmony whereof havehereunto set of t e sald nozzle, the looped portlon of my hand m prese of awo Wltnesses.

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of said nozzle whereby the gas in said Vtnssses:

loopedort-lon 1s heated and expanded, sub JEAN s,

stantla y as specled. Mmm@ Mommz

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